// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Diagnostics;
using System.IO;

namespace Microsoft.Data.SqlClient.Server
{
    // Simple wrapper over SmiStream that handles server events on the SqlClient side of Smi
    internal class SqlClientWrapperSmiStream : Stream
    {

        private SmiEventSink_Default _sink;
        private SmiStream _stream;

        internal SqlClientWrapperSmiStream(SmiEventSink_Default sink, SmiStream stream)
        {
            Debug.Assert(null != sink);
            Debug.Assert(null != stream);
            _sink = sink;
            _stream = stream;
        }

        public override bool CanRead
        {
            get
            {
                return _stream.CanRead;
            }
        }

        // If CanSeek is false, Position, Seek, Length, and SetLength should throw.
        public override bool CanSeek
        {
            get
            {
                return _stream.CanSeek;
            }
        }

        public override bool CanWrite
        {
            get
            {
                return _stream.CanWrite;
            }
        }

        public override long Length
        {
            get
            {
                long length = _stream.GetLength(_sink);
                _sink.ProcessMessagesAndThrow();
                return length;
            }
        }

        public override long Position
        {
            get
            {
                long position = _stream.GetPosition(_sink);
                _sink.ProcessMessagesAndThrow();
                return position;
            }
            set
            {
                _stream.SetPosition(_sink, value);
                _sink.ProcessMessagesAndThrow();
            }
        }

        public override void Flush()
        {
            _stream.Flush(_sink);
            _sink.ProcessMessagesAndThrow();
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            long result = _stream.Seek(_sink, offset, origin);
            _sink.ProcessMessagesAndThrow();
            return result;
        }

        public override void SetLength(long value)
        {
            _stream.SetLength(_sink, value);
            _sink.ProcessMessagesAndThrow();
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            int bytesRead = _stream.Read(_sink, buffer, offset, count);
            _sink.ProcessMessagesAndThrow();
            return bytesRead;
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            _stream.Write(_sink, buffer, offset, count);
            _sink.ProcessMessagesAndThrow();
        }
    }

}


